/* 17. Uluslararası Türk Omurga Kongresi (site31) — D Paleti
   ===================================================================
   TIP-TECH KARAKTER · SOĞUK KLİNİK STANDART · MODERN MİNİMAL
   ===================================================================
   L1 — Zemin (slate açık)         → sayfa nefesi
   L2 — Yumuşak yüzey (soft cyan)  → kart, badge zemini
   L3 — Ink (gece lacivert)        → metin/base
   L4 — Primary (mavi)             → orta vurgu, link hover, primary CTA
   L5 — Accent (cyan)              → birincil vurgu, ring, highlight
   L6 — Bold gradient (ink→mavi→cyan) → patlama: hero zemin, featured kart
   L6 — Soft gradient (slate radial) → sakinlik: hero overlay

   KURAL: çoğu sayfa nefes alır (L1-L2), kritik noktalar patlar (L5-L6).
   Razor'da inline hex yerine `[color:var(--xxx)]` veya semantik sınıf kullan.
*/

:root {
  /* ============================================================
     DNA — 6 katman (mavi ana + cyan ikincil — tıp-tech karakter)
     ============================================================ */

  /* L1 — Zemin */
  --bg:             #f1f5f9;   /* L1 zemin — slate-100 */
  --bg-cream:       #f8fafc;   /* yumuşak alternate zemin (slate-50) */

  /* L2 — Yumuşak yüzey */
  --surface-soft:   #cffafe;   /* soft cyan kart zemini (cyan-100) */
  --surface-deep:   #67e8f9;   /* doygun cyan (cyan-300) */
  --surface-mint:   #a5f3fc;   /* cyan-200 aksanı */

  /* L3 — Ink */
  --ink:            #0f172a;   /* L3 ink — gece lacivert (slate-900) */
  --ink-soft:       #1e293b;   /* slate-800 alt başlık */

  /* L4 — Primary (mavi) */
  --primary:        #1e40af;   /* L4 primary — kongre mavisi (blue-800) */
  --primary-darker: #1e3a8a;   /* hover (blue-900) */
  --primary-lighter:#3b82f6;   /* blue-500 */

  /* L5 — Accent (cyan) */
  --accent:         #06b6d4;   /* L5 accent — tıp-tech cyan (cyan-600) */
  --accent-darker:  #0891b2;   /* hover (cyan-700) */
  --accent-lighter: #67e8f9;   /* bright cyan (cyan-300) */

  /* Sıcak vurgu (livePulse, sponsor accent için, opsiyonel) */
  --warm:           #fbbf24;   /* amber-400 — AO Spine sarı badge */

  /* L6 — Gradient'lar */
  --gradient-bold:
    linear-gradient(135deg, #0f172a 0%, #1e40af 50%, #06b6d4 100%);
  --gradient-bold-reverse:
    linear-gradient(135deg, #06b6d4 0%, #1e40af 50%, #0f172a 100%);
  --gradient-soft:
    radial-gradient(ellipse at center,
      #f8fafc 0%, #f1f5f9 45%, #cffafe 100%);
  --gradient-soft-overlay:
    radial-gradient(ellipse at center,
      rgba(248, 250, 252, 0.30) 0%,
      rgba(207, 250, 254, 0.40) 60%,
      rgba(15, 23, 42, 0.35) 100%);

  /* ============================================================
     Geri uyumluluk — site30 alias adları (Razor partial reuse için)
     ============================================================ */
  --dark:           var(--ink);
  --mor:            var(--primary);
  --lila:           var(--accent);
  --green:          var(--primary);
  --orange:         var(--accent);
  --bg-darker:      var(--bg);
  --ink-lighter:    var(--ink-soft);
  --mor-darker:     var(--primary-darker);
  --lila-darker:    var(--accent-darker);
  --mor-lighter:    var(--primary-lighter);
  --lila-lighter:   var(--accent-lighter);
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
html { scroll-behavior: smooth; }

/* ============================================================
   SEMANTIK UTILITY SINIFLARI
   ============================================================ */

/* Renk — text */
.text-ink            { color: var(--ink); }
.text-ink-soft       { color: var(--ink-soft); }
.text-bg             { color: var(--bg); }
.text-bg-cream       { color: var(--bg-cream); }
.text-primary        { color: var(--primary); }
.text-primary-darker { color: var(--primary-darker); }
.text-accent         { color: var(--accent); }
.text-accent-darker  { color: var(--accent-darker); }

/* Renk — background */
.bg-ink              { background: var(--ink); }
.bg-ink-soft         { background: var(--ink-soft); }
.bg-bg               { background: var(--bg); }
.bg-bg-cream         { background: var(--bg-cream); }
.bg-surface-soft     { background: var(--surface-soft); }
.bg-surface-deep     { background: var(--surface-deep); }
.bg-primary          { background: var(--primary); }
.bg-primary-lighter  { background: var(--primary-lighter); }
.bg-accent           { background: var(--accent); }
.bg-accent-lighter   { background: var(--accent-lighter); }

/* Renk — border */
.border-ink     { border-color: var(--ink); }
.border-primary { border-color: var(--primary); }
.border-accent  { border-color: var(--accent); }

/* Yarı-saydam tonlar — ink rgb(15, 23, 42) */
.bg-ink-12     { background: rgba(15, 23, 42, 0.12); }
.bg-ink-70     { background: rgba(15, 23, 42, 0.70); }
.border-ink-12 { border-color: rgba(15, 23, 42, 0.12); }
.text-ink-70   { color: rgba(15, 23, 42, 0.70); }
.text-ink-40   { color: rgba(15, 23, 42, 0.40); }

/* L6 — Gradient utility'ler */
.bg-gradient-bold         { background: var(--gradient-bold); }
.bg-gradient-bold-reverse { background: var(--gradient-bold-reverse); }
.bg-gradient-soft         { background: var(--gradient-soft); }

/* Hero başlık — text gradient */
.text-gradient-bold {
  background: var(--gradient-bold);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ============================================================
   BİLEŞEN SINIFLARI
   ============================================================ */

/* Menü link hover */
.menu-link {
  color: var(--ink);
  font-weight: 500;
  transition: color 150ms ease;
}
.menu-link:hover { color: var(--accent); }

/* CTA buton — Kayıt (cyan accent → hover'da bold gradient patlar) */
.cta-kayit {
  background: var(--accent);
  color: #fff;
  transition: background 250ms ease, box-shadow 250ms ease, transform 200ms ease;
  position: relative;
  z-index: 0;
}
.cta-kayit:hover {
  background: var(--gradient-bold);
  box-shadow: 0 10px 28px -8px rgba(6, 182, 212, 0.50);
}

/* CTA buton — alternatif (mavi primary) */
.cta-primary {
  background: var(--primary);
  color: #fff;
  transition: background 150ms ease;
}
.cta-primary:hover { background: var(--primary-darker); }

/* Outline buton — solid bg zeminli */
.btn-outline {
  background: rgba(248, 250, 252, 0.95);
  border: 1px solid var(--ink);
  color: var(--ink);
  transition: all 150ms ease;
}
.btn-outline:hover {
  background: var(--ink);
  color: var(--bg);
}

/* Kart yüzeyi — hover'da L2 yumuşak yüzeye geçer */
.card-surface {
  background: #fff;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  transition: background 200ms ease, box-shadow 200ms ease;
}
.card-surface:hover {
  background: var(--surface-soft);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
}

/* Breadcrumb */
.breadcrumb { color: rgba(15, 23, 42, 0.7); font-size: 14px; }
.breadcrumb a { color: var(--ink); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb-sep { margin: 0 8px; color: rgba(15, 23, 42, 0.4); }

/* Fosforlu kalem (highlighter) — başlık vurguları */
.hl-accent {
  background: linear-gradient(transparent 60%, var(--accent) 60%);
  padding: 0.18em 0.5em;
  color: #fff;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.hl-primary {
  background: linear-gradient(transparent 60%, var(--primary) 60%);
  padding: 0.18em 0.5em;
  color: #fff;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* ============================================================
   HERO — full-bleed, omurga SVG + gradient + radial blob
   ============================================================ */
.hero {
  position: relative;
  min-height: 88vh;
  overflow: hidden;
  display: flex; align-items: center;
  padding: 80px 0 60px;
}
.hero-bg { position: absolute; inset: 0; }
.hero-gradient {
  position: absolute; inset: 0;
  background: var(--gradient-bold);
  background-size: 150% 150%;
  animation: heroGradientShift 30s ease-in-out infinite alternate;
}
@keyframes heroGradientShift {
  0%   { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}
.hero-blob {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 75% 25%, rgba(6, 182, 212, 0.5) 0%, transparent 38%),
    radial-gradient(circle at 25% 75%, rgba(30, 64, 175, 0.6) 0%, transparent 42%);
}
.hero-spine {
  position: absolute; right: 8%; top: 50%;
  transform: translateY(-50%);
  width: 120px; height: 360px;
  opacity: .9;
}
.hero-content {
  position: relative; z-index: 3;
  color: white; max-width: 720px;
}
.hero-badge {
  display: inline-block;
  font-weight: 600; font-size: .75rem;
  letter-spacing: .15em; text-transform: uppercase;
  padding: .4rem .85rem; border-radius: 99px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(1.75rem, 5vw, 3.5rem);
  font-weight: 800;
  color: white;
  margin-bottom: 1rem;
  letter-spacing: -.025em;
  line-height: 1.15;
  text-shadow: 0 2px 30px rgba(0, 0, 0, 0.2);
}
.hero-sub {
  font-size: clamp(.95rem, 1.5vw, 1.15rem);
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
  margin-bottom: 2rem;
  max-width: 540px;
}
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; }
.btn-hero-primary {
  background: white; color: var(--primary);
  padding: .85rem 1.75rem; font-size: .95rem; font-weight: 600;
  border-radius: 8px;
  display: inline-flex; align-items: center; gap: .5rem;
  transition: all .25s ease;
}
.btn-hero-primary:hover {
  background: var(--accent); color: white;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -6px rgba(0, 0, 0, 0.3);
}
.btn-hero-primary span { transition: transform .25s ease; display: inline-block; }
.btn-hero-primary:hover span { transform: translateX(4px); }
.btn-hero-ghost {
  background: rgba(255, 255, 255, 0.08); color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: .85rem 1.75rem; font-size: .95rem; font-weight: 600;
  border-radius: 8px;
  backdrop-filter: blur(10px);
  transition: all .25s ease;
}
.btn-hero-ghost:hover { background: rgba(255, 255, 255, 0.18); }

@media (max-width: 968px) {
  .hero-spine { right: 4%; width: 80px; height: 240px; opacity: .5; }
}
@media (max-width: 640px) {
  .hero { min-height: auto; padding: 80px 0 60px; }
  .hero-spine { right: 4%; bottom: 5%; top: auto; transform: none; width: 50px; height: 150px; }
}

/* ============================================================
   HERO SLIDER (slayt görseli + dot navigation)
   ============================================================ */
.hero-slider {
  position: absolute; inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-slide {
  position: absolute; inset: 0;
  opacity: 0;
  transform: translateX(60px);
  transition: opacity 800ms ease, transform 800ms ease;
}
.hero-slide.is-active {
  opacity: 1;
  transform: translateX(0);
}
@media (prefers-reduced-motion: reduce) {
  .hero-slide { transform: none; transition: opacity 200ms ease; }
}
.hero-img {
  width: 100%; height: 100%; 
  object-position: center center;
  display: block;
}
.hero-overlay {
  position: absolute; inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(90deg,
    rgba(15, 23, 42, 0.75) 0%,
    rgba(15, 23, 42, 0.45) 50%,
    rgba(15, 23, 42, 0.20) 100%);
}
.hero-slider-dots {
  position: absolute; bottom: 24px; left: 50%;
  transform: translateX(-50%);
  display: flex; gap: 8px;
  z-index: 4;
}
.hero-slider-dots button {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none; cursor: pointer;
  transition: all 220ms ease;
  padding: 0;
}
.hero-slider-dots button:hover { background: rgba(255, 255, 255, 0.7); }
.hero-slider-dots button.is-active {
  background: var(--accent);
  width: 32px;
  border-radius: 5px;
}

/* ============================================================
   SECTION HEAD — genel başlık bloğu
   ============================================================ */
.section-head {
  text-align: center;
  margin-bottom: 48px;
  max-width: 720px;
  margin-left: auto; margin-right: auto;
}
.section-eyebrow {
  display: inline-block;
  font-weight: 600;
  font-size: .8rem; letter-spacing: .15em; text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .75rem;
}
.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -.025em;
  margin-bottom: .75rem;
  color: var(--ink);
}
.section-head p {
  color: rgba(15, 23, 42, 0.65);
  font-size: 1.05rem; line-height: 1.6;
}

/* Link-arrow */
.link-arrow {
  font-size: .9rem; font-weight: 600; color: var(--accent);
  display: inline-flex; align-items: center; gap: .35rem;
  transition: gap .25s ease;
}
.link-arrow:hover { gap: .6rem; }
.link-arrow span { transition: transform .25s ease; }
.link-arrow:hover span { transform: translateX(3px); }

/* ============================================================
   COUNTDOWN — 5 büyük kutu (Gün/Saat/Dak/Sn + Erken Kayıt accent)
   ============================================================ */
.countdown-section { background: var(--bg); padding: 80px 0; }
.cd-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(5, 1fr);
  gap: 12px; padding: 0 24px;
}
.cd-box {
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  padding: 28px 16px;
  text-align: center;
  transition: all .25s ease;
}
.cd-box:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
  border-color: var(--accent);
}
.cd-box.cd-accent {
  background: var(--gradient-bold);
  border: none;
  color: white;
  position: relative; overflow: hidden;
}
.cd-box.cd-accent::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(6, 182, 212, 0.4) 0%, transparent 50%);
}
.cd-box.cd-accent > * { position: relative; z-index: 2; }
.cd-num {
  font-weight: 800; font-size: 2.5rem; line-height: 1;
  background: var(--gradient-bold);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-variant-numeric: tabular-nums;
}
.cd-box.cd-accent .cd-num {
  background: none;
  -webkit-text-fill-color: white;
  color: white;
}
.cd-label {
  font-weight: 600; font-size: .75rem;
  color: rgba(15, 23, 42, 0.65);
  letter-spacing: .1em; text-transform: uppercase;
  margin-top: .35rem;
  line-height: 1.3;
}
.cd-box.cd-accent .cd-label { color: rgba(255, 255, 255, 0.85); }
.cd-num.cd-pulse { animation: cdPulse .35s ease; }
@keyframes cdPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
@media (max-width: 768px) {
  .cd-grid { grid-template-columns: repeat(2, 1fr); }
  .cd-box.cd-accent { grid-column: 1 / -1; }
  .cd-num { font-size: 2rem; }
}

/* Önemli Tarihler */
.important-dates {
  max-width: 1180px; margin: 40px auto 0;
  padding: 24px;
  background: white;
  border-radius: 16px;
  border: 1px solid rgba(15, 23, 42, 0.10);
}
.important-dates h3 {
  font-size: 1rem; font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
  letter-spacing: -.015em;
}
.dates-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.date-item {
  background: var(--bg);
  border-radius: 8px;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
}
.date-item .d-label {
  font-size: .68rem; letter-spacing: .1em; text-transform: uppercase;
  color: rgba(15, 23, 42, 0.55); font-weight: 600;
  margin-bottom: 4px;
}
.date-item .d-value {
  font-size: .95rem; font-weight: 700;
  color: var(--primary);
}
@media (max-width: 768px) {
  .dates-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   STATS — Sayıyla Kongre (4 stat + sayaç)
   ============================================================ */
.stats { background: white; padding: 80px 0; }
.stat-grid {
  max-width: 1180px; margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; padding: 0 24px;
}
.stat-card {
  background: white;
  border-radius: 16px;
  padding: 28px;
  text-align: center;
  border: 1px solid rgba(15, 23, 42, 0.10);
  transition: all .25s ease;
}
.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
  border-color: var(--accent);
}
.stat-num {
  font-weight: 800;
  font-size: 3rem; line-height: 1;
  background: var(--gradient-bold);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: .35rem;
}
.stat-label {
  font-weight: 700;
  font-size: 1rem; color: var(--ink);
  margin-bottom: .35rem;
}
.stat-card p {
  font-size: .85rem; color: rgba(15, 23, 42, 0.55); line-height: 1.5;
}
@media (max-width: 768px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-num { font-size: 2.25rem; }
}

/* ============================================================
   INVITATION — Davet / Başkan Mesajı
   ============================================================ */
.invitation { background: var(--bg); padding: 80px 0; }
.invitation-grid {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 1.6fr 1fr;
  gap: 48px; align-items: center;
}
.invitation-text h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -.025em;
  margin: .35rem 0 1.5rem 0;
  color: var(--ink);
}
.invitation-text p {
  color: rgba(15, 23, 42, 0.75);
  line-height: 1.7;
  margin-bottom: 1rem;
  font-size: 1rem;
}
.invitation-text p strong { color: var(--ink); font-weight: 700; }
.president-card {
  background: var(--gradient-bold);
  border-radius: 16px;
  padding: 32px 28px;
  color: white;
  text-align: center;
  position: relative; overflow: hidden;
}
.president-card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 70% 30%, rgba(6, 182, 212, 0.4) 0%, transparent 45%);
}
.president-card > * { position: relative; z-index: 2; }
.president-photo {
  width: 80px; height: 80px;
  background: rgba(255, 255, 255, 0.15);
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  margin: 0 auto 16px;
  display: flex; align-items: center; justify-content: center;
}
.president-name { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.president-title { font-size: .8rem; color: rgba(255, 255, 255, 0.8); letter-spacing: .05em; }
.president-divider {
  width: 40px; height: 1px;
  background: rgba(255, 255, 255, 0.3);
  margin: 16px auto;
}
.president-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
  margin-top: 4px;
}
.president-grid .president-item { text-align: center; }
.president-grid .president-photo {
  width: 80px; height: 80px;
  margin: 0 auto 12px;
}
@media (max-width: 500px) {
  .president-grid { grid-template-columns: 1fr; gap: 18px; }
}
@media (max-width: 968px) {
  .invitation-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* ============================================================
   PROGRAM — Mini sekmeli tablo
   ============================================================ */
.program { background: white; padding: 80px 0; }
.program-container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.program-tabs {
  display: flex; gap: 4px;
  margin-bottom: 16px;
  border-bottom: 2px solid rgba(15, 23, 42, 0.10);
  flex-wrap: wrap;
}
.prog-tab {
  padding: 10px 16px;
  font-size: .9rem; font-weight: 600;
  color: rgba(15, 23, 42, 0.55);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all .25s ease;
  display: inline-flex; align-items: center; gap: 4px;
  background: none; border-left: none; border-right: none; border-top: none;
}
.prog-tab .day-num {
  font-weight: 800; color: var(--accent);
  font-size: 1rem;
}
.prog-tab .day-mon { display: none; }
.prog-tab:hover { color: var(--primary); }
.prog-tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}
@media (min-width: 640px) { .prog-tab .day-mon { display: inline; } }

.prog-panel { display: none; flex-direction: column; gap: 8px; }
.prog-panel.active { display: flex; }
.prog-row {
  display: grid; grid-template-columns: 80px 1fr 100px;
  gap: 16px; padding: 14px 18px;
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 8px;
  font-size: .9rem;
  align-items: center;
  transition: all .25s ease;
}
.prog-row:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}
.prog-row .time { color: var(--primary); font-weight: 700; }
.prog-row .title { color: var(--ink); font-weight: 500; }
.prog-row .salon { color: rgba(15, 23, 42, 0.55); font-size: .8rem; text-align: right; }
.prog-row.keynote {
  background: linear-gradient(90deg, rgba(6, 182, 212, 0.06), white);
  border-left: 3px solid var(--accent);
}
@media (max-width: 640px) {
  .prog-row { grid-template-columns: 60px 1fr; gap: 10px; }
  .prog-row .salon { grid-column: 2 / 3; text-align: left; font-size: .75rem; }
}

/* ============================================================
   SPEAKERS — Yatay carousel
   ============================================================ */
.speakers { background: var(--bg); padding: 80px 0; }
.speakers-container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.carousel-nav { display: flex; align-items: center; gap: 6px; }
.carousel-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  color: var(--primary);
  font-size: 1.2rem; font-weight: 700;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all .25s ease;
  cursor: pointer;
}
.carousel-btn:hover {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}
.carousel-btn:disabled { opacity: .4; cursor: not-allowed; }
.speaker-carousel {
  display: flex; gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none;
  padding-bottom: 8px;
}
.speaker-carousel::-webkit-scrollbar { display: none; }
.speaker-card {
  flex: 0 0 220px;
  scroll-snap-align: start;
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
  transition: all .25s ease;
}
.speaker-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
}
.sp-photo {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--gradient-bold);
  color: white;
  font-weight: 700; font-size: 1.1rem;
  display: inline-flex; align-items: center; justify-content: center;
  margin: 0 auto 12px;
  overflow: hidden;
}
.sp-photo img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.sp-name {
  font-size: .95rem; font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px; line-height: 1.25;
}
.sp-title {
  font-size: .75rem; color: rgba(15, 23, 42, 0.55);
  margin-bottom: 10px; line-height: 1.3;
}
.sp-flag {
  display: inline-block;
  font-size: .68rem; font-weight: 600;
  background: var(--surface-soft); color: var(--accent-darker);
  padding: .2rem .5rem; border-radius: 99px;
}

/* ============================================================
   CTA SECTION — Kayıt + Bildiri (2 gradient kart)
   ============================================================ */
.cta-section { background: white; padding: 80px 0; }
.cta-grid {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.cta-card {
  border-radius: 20px;
  padding: 40px 36px;
  position: relative; overflow: hidden;
  color: white;
  background: var(--gradient-bold);
  display: flex; flex-direction: column;
}
.cta-card::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(6, 182, 212, 0.5) 0%, transparent 40%),
    radial-gradient(circle at 10% 90%, rgba(30, 64, 175, 0.5) 0%, transparent 40%);
}
.cta-card > * { position: relative; z-index: 2; }
.cta-card.cta-paper { background: linear-gradient(135deg, #0f172a 0%, #06b6d4 100%); }
.cta-icon {
  width: 56px; height: 56px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  display: inline-flex; align-items: center; justify-content: center;
  color: white;
  margin-bottom: 20px;
  backdrop-filter: blur(10px);
}
.cta-eyebrow {
  display: inline-block;
  font-weight: 700; font-size: .68rem;
  letter-spacing: .15em; text-transform: uppercase;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: .25rem .55rem; border-radius: 99px;
  margin-bottom: 12px;
  width: fit-content;
  backdrop-filter: blur(10px);
}
.cta-card h3 {
  font-size: 1.6rem; color: white;
  margin-bottom: 10px;
  letter-spacing: -.025em;
  font-weight: 700;
}
.cta-card p {
  font-size: .95rem; color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
  margin-bottom: 24px; flex: 1;
}
@media (max-width: 768px) {
  .cta-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   BOARDS — Kurullar (3 sütun)
   ============================================================ */
.boards { background: var(--bg); padding: 80px 0; }
.boards-grid {
  max-width: 1180px; margin: 0 auto; padding: 0 24px;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.board-card {
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  padding: 28px 24px;
  transition: all .25s ease;
}
.board-card:hover {
  border-color: var(--accent);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
  transform: translateY(-2px);
}
.board-card h3 {
  font-size: 1.15rem;
  color: var(--primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--surface-soft);
  font-weight: 700;
}
.board-list { margin-bottom: 16px; }
.board-list li {
  padding: 8px 0;
  font-size: .9rem;
  color: rgba(15, 23, 42, 0.75);
  border-bottom: 1px dashed rgba(15, 23, 42, 0.10);
}
.board-list li:last-child { border-bottom: none; }
@media (max-width: 968px) {
  .boards-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   NEWS — Haberler/AO Spine (1 featured + 2 normal kart)
   ============================================================ */
.news { background: white; padding: 80px 0; }
.news-container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.news-grid {
  display: grid; grid-template-columns: 1.5fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 20px;
}
.card-featured {
  grid-row: 1 / 3;
  position: relative; overflow: hidden;
  border-radius: 16px;
  min-height: 360px;
  display: flex; flex-direction: column;
  color: white; padding: 32px;
  background: var(--gradient-bold);
  transition: all .25s ease;
}
.card-featured:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px -10px rgba(30, 64, 175, 0.4);
}
.card-featured-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 70% 30%, rgba(6, 182, 212, 0.5) 0%, transparent 40%),
    radial-gradient(circle at 20% 80%, rgba(30, 64, 175, 0.5) 0%, transparent 35%),
    linear-gradient(180deg, transparent 50%, rgba(0, 0, 0, 0.2) 100%);
  z-index: 1;
}
.card-featured-content {
  position: relative; z-index: 2;
  display: flex; flex-direction: column; height: 100%;
}
.card-featured-top { display: flex; gap: .5rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.card-badge {
  font-size: .7rem; font-weight: 700;
  letter-spacing: .1em; text-transform: uppercase;
  background: rgba(255, 255, 255, 0.18); color: white;
  padding: .35rem .75rem; border-radius: 99px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(10px);
}
.card-tag-live {
  font-size: .7rem; font-weight: 700;
  background: var(--warm); color: var(--ink);
  padding: .35rem .75rem; border-radius: 99px;
  position: relative;
}
.card-tag-live::before {
  content: ""; display: inline-block;
  width: 6px; height: 6px; border-radius: 50%;
  background: #DC2626; margin-right: .35rem;
  animation: livePulse 1.6s ease-in-out infinite;
}
@keyframes livePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}
.card-featured h3 {
  font-size: clamp(1.4rem, 2.5vw, 1.85rem); color: white;
  margin-bottom: .75rem; line-height: 1.2;
  font-weight: 700; letter-spacing: -.025em;
}
.card-featured p {
  font-size: .95rem; color: rgba(255, 255, 255, 0.85);
  line-height: 1.6; max-width: 480px; flex: 1;
}
.card-meta { font-size: .85rem; color: rgba(255, 255, 255, 0.9); margin-top: 1rem; }
.card-featured-arrow {
  position: absolute; top: 24px; right: 24px;
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; color: white;
  backdrop-filter: blur(10px);
  z-index: 3;
  transition: all .25s ease;
}
.card-featured:hover .card-featured-arrow {
  background: white; color: var(--primary);
  transform: rotate(-12deg) scale(1.1);
}

.card-news {
  background: white; border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  padding: 24px;
  display: flex; flex-direction: column;
  transition: all .25s ease;
}
.card-news:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
}
.news-cat {
  display: inline-block;
  font-size: .68rem;
  letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); font-weight: 700;
  margin-bottom: .75rem;
}
.card-news h4 {
  font-size: 1.05rem; line-height: 1.3;
  margin-bottom: .65rem; font-weight: 700;
  color: var(--ink);
}
.card-news p {
  font-size: .88rem; color: rgba(15, 23, 42, 0.75);
  line-height: 1.6; flex: 1;
  margin-bottom: 1rem;
}
.news-foot {
  display: flex; justify-content: space-between; align-items: center;
  font-size: .8rem;
  border-top: 1px solid rgba(15, 23, 42, 0.10);
  padding-top: .75rem;
}
.news-date { color: rgba(15, 23, 42, 0.55); }
.news-arrow {
  color: var(--accent); font-weight: 600;
  transition: transform .25s ease;
  display: inline-block;
}
.card-news:hover .news-arrow { transform: translateX(4px); }
@media (max-width: 968px) {
  .news-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .card-featured { grid-row: auto; min-height: 320px; }
}

/* ============================================================
   SPONSORS — Logo şerit (6 kart grayscale → renkli)
   ============================================================ */
.sponsors { background: white; padding: 80px 0; }
.sponsors-container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.sponsors-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px;
}
.sponsor {
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  padding: 24px 16px;
  text-align: center;
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: .4rem;
  min-height: 120px;
  transition: all .25s ease;
  filter: grayscale(100%); opacity: .7;
}
.sponsor:hover {
  filter: grayscale(0%); opacity: 1;
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px -10px rgba(6, 182, 212, 0.25);
}
.sp-text {
  font-weight: 800;
  font-size: 1.1rem; color: var(--primary);
  line-height: 1.1;
}
.sponsor small {
  font-size: .68rem; color: rgba(15, 23, 42, 0.55); line-height: 1.3;
}
@media (max-width: 968px) { .sponsors-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px) { .sponsors-grid { grid-template-columns: repeat(2, 1fr); } }

/* ============================================================
   CONTACT — İletişim + Harita
   ============================================================ */
.contact { background: var(--bg); padding: 80px 0; }
.contact-container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.contact-grid {
  display: grid; grid-template-columns: 1fr 1.4fr;
  gap: 32px; align-items: stretch;
}
.contact-info {
  background: white;
  border: 1px solid rgba(15, 23, 42, 0.10);
  border-radius: 16px;
  padding: 32px;
  display: flex; flex-direction: column; gap: 20px;
}
.contact-item .ci-label {
  font-size: .7rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--accent); font-weight: 700;
  margin-bottom: 6px;
}
.contact-item .ci-value {
  font-size: 1rem; color: var(--ink); font-weight: 600;
  line-height: 1.5;
}
.contact-item .ci-value a { color: var(--primary); }
.contact-item .ci-value a:hover { color: var(--accent); }
.contact-map {
  background: var(--gradient-bold);
  border-radius: 16px;
  min-height: 320px;
  position: relative; overflow: hidden;
}
.map-placeholder {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 32px; text-align: center;
}
@media (max-width: 968px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   SCROLL REVEAL — IntersectionObserver tetikli
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .7s ease, transform .7s ease;
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   REDUCED MOTION — erişilebilirlik
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .hero-gradient { animation: none; }
  .card-tag-live::before { animation: none; opacity: 1; }
  .speaker-carousel { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}